CN103592626A - Time difference window calculating method for wide-wave-beam time difference positioning system - Google Patents
Time difference window calculating method for wide-wave-beam time difference positioning system Download PDFInfo
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- CN103592626A CN103592626A CN201310584800.8A CN201310584800A CN103592626A CN 103592626 A CN103592626 A CN 103592626A CN 201310584800 A CN201310584800 A CN 201310584800A CN 103592626 A CN103592626 A CN 103592626A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/12—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial
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- Radar, Positioning & Navigation (AREA)
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- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention discloses a time difference window calculating method for a wide-wave-beam time difference positioning system. The method can reduce the hyperbola (hyperboloid) time difference positioning equation solving frequency, reduce calculation amount, reduce the time difference positioning fuzzy number and improve time difference positioning algorithm efficiency. According to the positions of three detection stations and the wave beam pointing directions of the detection stations of the time difference positioning system, the maximum time difference and the minimum time difference of each kind of wave beam combination are calculated as the bounds of a time difference window. The method for calculating the time difference window on the basis of the positions of the three detection stations and the wave beam pointing directions of the detection stations can reduce the length of calculating the time difference window by the adoption of the base length, and can be directly applied to the wide-wave-beam time difference positioning system, reduce the time difference positioning fuzzy number and improve the time difference positioning efficiency.
Description
Technical field
The present invention relates to a kind of computing method of time difference pairing time difference window of broad beam time difference positioning system, fuzzy number for reducing time difference location, reduce and solve hyperbolic curve (face) cross bearing degree of equation, relate in particular to a kind of time difference window computing method of broad beam time difference positioning system, utilize time difference window to limit Pulse pairing scope, reduce the fuzzy number of time difference location.
Background technology
Time difference location is the mistiming of utilizing same emitter Signals to arrive distribution multistation to form a kind of passive location technology that hyperbolic curve (face) positions.Long baseline time difference location, because its positioning precision is high, location algorithm is simple, is widely used in Project Realization.But long baseline time difference system exists intrinsic time difference location ambiguity problem.The many solutions problem due to hyperbolic curve (face) cross bearing equation on the one hand; Be Pulse pairing fuzzy problem on the other hand, especially, when emitter Signals is high repetition signal, the fuzzy marriage problem causing is even more serious.
In order to reduce time difference location ambiguity, a kind of the most frequently used method is to calculate between two stations poor scope (being called time difference window) time of arrival, and the Pulse pairing of the poor scope of overtime be false pairing, thereby plays the object of reduction time difference location ambiguity number.At present, the computing method of conventional time difference window, the principle of mainly utilizing the difference on triangle both sides to be less than the 3rd limit is calculated time difference window.Like this, the scope of the time difference window of calculating be generally [
l/ c,
l/ c], wherein
lbe the distance between two stations, c is the light velocity.
In order to realize the intercepting and capturing of multistation to same signal, time difference positioning system often adopts broad beam design, is used to form large territory, common footprint, and the orientation that the switching controls of broad beam time difference positioning system by wave beam realizes in investigative range covers.By territory, multistation instantaneous wave beam common footprint in compute beam range of control, and the time difference window in territory, wave beam common footprint is calculated, can reduce time difference window scope, reduce the fuzzy number of time difference location, improve time difference positioning system usefulness.
Summary of the invention
The present invention is for solving broad beam time difference positioning system location ambiguity problem, for three station broad beam time difference positioning systems, according to three acquisition station positions of time difference positioning system and beam position separately, calculate territory, common footprint under various beam combination, and it is poor to calculate in territory, common footprint maximum time difference and minimum time, bound as time difference window, can reduce time difference location ambiguity number, reduce the number of times that solves hyperbolic curve (face) time difference positioning equation, reduce calculated amount, improve time difference positioning system usefulness.
The present invention is that the technical solution that its technical matters of solution adopts is: calculate each territory, beam combination common footprint, three stations, and the maximum time difference in territory, common footprint and the minimum time difference are calculated, when locating, the time difference first by maximum time difference window and minimum time difference window, judges the ineligible Pulse pairing mistiming situation of rejecting, reduce the number of times that solves hyperbolic curve (face) cross bearing equation, reduce calculated amount.
The present invention compares with art methods, and the time difference window that can effectively realize broad beam time difference positioning system calculates.The time difference window computing method of the method development that the present invention provides can effectively reduce time difference location ambiguity number, reduce the number of times that solves hyperbolic curve (face) time difference positioning equation, reduce calculated amount, improve Localization Estimate Algorithm of TDOA usefulness.
Accompanying drawing explanation
Fig. 1 is time difference window calculation flow chart figure, has provided the General Implementing mode of the time difference window calculating of broad beam time difference positioning system.
Fig. 2 is two wave beam public domain schematic diagram, has provided and has asked any two station two wave beam public domain schematic diagram.
Fig. 3-Fig. 6 has provided the various situations whether schematic diagram in a certain wave beam of intersection point that judges.
Embodiment
Below in conjunction with accompanying drawing 1-accompanying drawing 6, provide the embodiment of the time difference window calculating of broad beam time difference positioning system.
1, overall system embodiment
Overall system embodiment is as shown in Figure 1: the intersection point that 1) solves any two beam boundaries at any two stations; 2) whether the judgement intersection point of trying to achieve is in the wave beam at the 3rd station; 3) reject the not intersection point in the 3rd station wave beam, obtain the relevant extreme point (remaining intersection point) of mistiming in three territories, wave beam common footprint; 4) change the combination of two relation of above-mentioned three station wave beams, repeat 1)-3) obtain all extreme points, the territory, common footprint consisting of the extreme point obtaining, calculates maximum time difference window and minimum time difference window; 5) repeat above-mentioned steps, until the three all beam combination in station all traverse.
2, ask the intersection point of any two wave beams in any two stations
Fig. 2 has provided the schematic diagram that calculates any two beam boundary intersection points in any two stations.According to how much ultimate principles, calculate and take intersection point A, B, C, the D of the beam coverage inner boundary ray that site is end points.
3, judge that intersection point is whether in three wave beam public domains, station
Fig. 3-Fig. 6 has provided the various situations whether schematic diagram in a certain wave beam of intersection point that judges, if in this wave beam, this o'clock, in three station common beam, otherwise is rejected this point.
An intersection point supposing any two station two wave beams is P, now will judge that P point is whether in the 3rd a certain wave beam in station, and wherein two of the 3rd a certain wave beam in station boundary straight line are respectively AB and AC, and their slope is respectively
k 1,
k 2.
First discuss when PA is during perpendicular to X-axis, if k now
1* k
2>=0, P point is not in this wave beam, if k
1* k
2<0, P point is in wave beam, as shown in Figure 3.
When PA is not orthogonal to X-axis, the slope of straight line PA is made as
k 3, according to method judging point P below whether in wave beam BAC:
1) k
1* k
2>=0 o'clock (Fig. 4)
2) k
1* k
2during <0 (Fig. 5)
(1) if the pitch angle of AC and AB differs 40 °
(2) when the inclination angular difference of AC and AB is greater than 40 °, if still as stated above judgement can become judging point P whether in wave beam BAD, make a mistake, now should be by method judgement below.Suppose the 3rd station coordinates for (
x 0,
y 0), P point coordinate be (
x,
y).(Fig. 6)
I) the 3rd stand in X-axis when left side
II) the 3rd while standing in X-axis right side
4, calculate time difference window
The intersection point calculating according to step 1-3 (mistiming extreme point), calculates each intersection point to the range difference at each station, gets that corresponding ultimate range is poor and the poor intersection point of minor increment calculates maximum time difference respectively and minimum time is poor, as the bound of time difference window.
Claims (2)
1. the time difference window computing method of a broad beam time difference positioning system, it is characterized by: can be according to three acquisition station positions of time difference positioning system and beam position separately, calculate the public search coverage that the three any beam combination in station cover, obtain the intersection point of public search coverage as mistiming extreme point, then calculate this public search coverage poor and minor increment is poor and be converted into maximum time difference and minimum time is poor to the ultimate range at two stations, as the bound of the time difference window in the beam combination situation of this kind, three station, reduce time difference location ambiguity number.
2. one kind judges three wave beam public domain methods, can be according to beam position, calculate the public search coverage of three wave beams under various cloth station and wave beam coverage condition, it is characterized by: first utilize intersection point that geometric relationship calculates two beam boundaries, station wherein as mistiming extreme point, the slope of the line by these intersection points and the 3rd station judges whether in the wave beam at the 3rd station, rejects poor extreme point ineffective time; Choose two different station combinations and in kind calculate useful cross, the region that the useful cross that finally all combinations calculate surrounds is the public search coverage under these three beam combination of three stations.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114841297A (en) * | 2022-07-05 | 2022-08-02 | 成都戎星科技有限公司 | DTO separation-based multi-satellite passive positioning scattered target classification method |
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2013
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| US5987329A (en) * | 1997-07-30 | 1999-11-16 | Ericsson Inc | System and method for mobile telephone location measurement using a hybrid technique |
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| US20070222664A1 (en) * | 2006-03-24 | 2007-09-27 | Sensis Corporation | Method and system for correlating radar position data with target identification data, and determining target position using round trip delay data |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114841297A (en) * | 2022-07-05 | 2022-08-02 | 成都戎星科技有限公司 | DTO separation-based multi-satellite passive positioning scattered target classification method |
| CN114841297B (en) * | 2022-07-05 | 2022-09-06 | 成都戎星科技有限公司 | DTO separation-based multi-satellite passive positioning scattered target classification method |
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Application publication date: 20140219 |